Spring collet chuck



.Apfil 10,1928. 1,665,250

E. F. ATKINS SPRING COLLET CHUCK Filed May 10, {9'27 2 Sfieets-Sheet ,1

- INVENTOR CBC/21x ATTORNEYS April 10, 1928. 1,665,259

E. F. ATKINS SPRING COLLET cnucx Filed May 10. 1927 2 Sheets-Sheet 2 23*;5; Fagin gag; f3

INVENTOR I Patented pr. 10, 1928.

MOTOR comrany, on NEW ORK, N. 2., A conronarron or DELAWARE.

. SPRING GOLLET Gama Application filed m 10, 1927. Serial at. 190,329)" The present invention relates to chucks carried by lathes, milling machines and other similar structures wherein the piece to be machined is held in proper relation to the cutting tool and the necessary operations are performed in a desired manner. In many in castings become troublesome.

stances, where one particular operation is effected, or where aiseriesof cuts are'to be taken on every piece machined, it is the usual practice to secure the piece in the chuck and take the cuts from a previous and standard setting of the tool and work,

the setting having been made to accommodate the castings to be machined.

With a given setting, it isfound that the castings, vary in size and cause a lack of uniformity in the finished article. Particularly in collet chucks where the jaws are moved axially into engaging position by means of earns, the surfaces of whichare inject of the present invention to provide acollet chuck with means to insure a proper positioning 'ofthe piece to enable accurate cutting to result without resetting the machine in spite of irregularities in the relative sizes of successive castings. The broad idea upon which the invention is formulated includes the provision of a positive stop, in a preferred construction shown as mounted in the center of the chuck, against which the casting, or pieceto be machined, abuts in the movement of the jaws to grip it. Regardless of the extent of movement of the jaws'neoessary to effect the gripping, the stop will a1- waysposition the work in the'same position relative to the cutting tool and the difvficulties encountered in 7 previous, construc tions are thus overcome. A further ObJBCt of the flnventioni s to incorporate in the Structure Which effects this positioning, hereinafter termed the .stop, a positive means for expanding the jaws automatically in disengaging the work so'that it may be withdrawn easily without manually se' arating the jaws. 7

Among other objects it is'proposed to em positively separated when they body the above featuresin a construction which is strong and sure of operation and in carrying out the above thought the chuck has been designed so that the gripping thrust and reactions are takendirectly by the external shell. g 7 'L In 'order that the invention may be 'un-' EARL F. -ATKINS, OF PLAINFIEL D, NEW JERSEY, ASSIGN OR '10 INTERNATIONAL I derstood more fully'and the specific'manner in Whiclritmay be constructed, reference will now be had to the accompanying drawin'gs for 'a'more detailed description'thereof, wherein: I U 1 Figure l isja View in longitudinal sectionshowing a chuck with the stop mounted therei. I

Figure 2 is anend elevationwith parts broken away to-showi the manner in'which the stop is mounted. I

."Figure 3 is a-"perspective View, partly in section, showing the manner in which the element'sareassembled. f v

Figure 4 is a segmental view in section showing the manner in which the jaws are are moved to disengage the work. I p Figure5 is a longitudinal section showing a modified form of the invention. a

Figureti is a detail view showing-the stop used in the modified construction. M

Referring particularly to Figures 1 through 4, a designates a, hollow spindle carried by a'='lathe or other machine and provided with a-threa ded extension on. The chuck is formed of' a hollow cylindrical shell member 1)} which is threaded to the ex tension' aand may be tightened by means of recesses 6' adapted to receive a suitable spanner wrench,

Pressed into the inner cylindrical portio -b is an inner cam ring 6 and in the cylindrical portion-b of greater diameter isan outer cam ring '6 jThe cam faces are preferably formedto be at 30 degrees from the. axis of the chuck and-a spacer-sleeve b is positioned between the rings. Suitable set screws b secure thesleeve 7) in position and set screws' 6 position cam ring" 6 KVV'thin the cylindrical shell 22 jaws care provided, there "being preferably three spaced about the internal peripheryof; the shell, each having a suitable grippingfpad' c to bear against the work, and held in position by screws 0 The outer surfaces of the jaws are formed with earn faces a a which engage earn areas 5 and b, re

spectively'. The inner surface of the jaws has formed thereon cam surface a between which and an extension is a recessed groove 0. A dog (1 having a recessed portion d and a flan 'ed end d is carried on an The extenslon 0 as re operating rod d ceived in the groove d and the flanged end (P engages the groove 07. .In this manner rod d" operates the jaws of the chuck and causes the work 6 to be securely held.

lEormed on the spacer ring I) arerspaced lugs b" which lie between adjacent sides of the ,jaws of the chucks Notches Z) are Q fQI'm ed on the lugs and receive arms f of a eentrally disposed stop member f. ,There are a number of arms f to equal the number oi'lugs and it is in this manner that the stop member isp sitioned Upon the sides Of theistop f, cam faces 7? are provided for eotoperating with cam faces 0 to separate the 'jaws when the dog J moves outwardly. Screwsf secure the arms f to the lugs,

' f it is frequently desirable to provide a stop character described above which abuts against-Ia certain portion of the piece to be mac ined ndirwn t i n 1 another portion.- Ac'cordingly a modified form of the invention is shown in Figures 1 hand 6. Themajor portion-of the chuck described above is used,jthe'only difference '7 7 "being in the-form of the stopemployed," As

shown: n th se fi u e he. t p f 18 P vided with spacedfingers it which extend outwa y Paral el to he axis of the chuck:

and are designed to engage .the piece e EhQW i qt nd da hlines, e j 0 lie between the fingers f andtheirengaging movement is .thus unimpaired by the Itwi en t e stop will positiv lyposition the work in a predetermined pos t cn' regard ss of he re ative ize fot thei copper-Eating therewith in the axial mov ,ment of the jaw with respect tothe chuck move the jaw into-engagement with-the" Iwork, a cam surfaoe lon the interior of the lflwyastop to position the work positively o in an axial-direction, and'a camsurfaoeon V stop co-operating with theinterior cam sgrface in the reversemovement, of the' jaw to disengage the latter positively from, the

2. A colletchuck comprising shell, a

jaw movably carried in the shell, meansvto move the jaw axially with respect to the shell, removable cam rings on the interior ofrth shell, a spacerring therebetween, and co-operating cam surfaces on the exterior of the jaw for moving the jaw into engagement with the Work in its axial movement.

3,;A collet chuck comprising a shell, a jaw movablycarried in the shell, means to move the jaw axially with respect to the shell, cam rings on the interior oftheshell, V v j I a spacer ring therebetween, a stop carried by the spacer ring, and cofoperating cam surfaces on the exterior of the jaW formoving thejw into engagement with thework in its axial movement. p I

4. A collet chuck comprising a shell, a

j aw movably carried in the shell, means to 'rn'ove the jaw axially with respect to the shell, cam rings on the interior of the-shell. 'a-spacer ring therebetween, a stop carried by the spacer ring, radial lugsformed there on, a stop carried by the lugs and ,co-oper-v ating cam surfaces on the exterior of the,

with the Work in its movement.

jaw mova ly arried i the hell, means to move. h jaw axially th. resp to he shell, cam rings on the interior of the shell,

'a'spacer ring thereloetavsen, a. stop carried by the pace ng, radi gs formedthere 95.

on, a stop pletaa n e top, means, for secu ng he arms an ugs, a d t iq m 'flg cam surfaces on the exterior of the aw for 'aw for' moving the jaw into engagement 5- 1 olle huc comp l nga he l, a

moving the jaw into engagement with the work in its axial movement. v V 1 A ol etchuck comprisinga shell, a p u alityof Spaced jawswithin the shell, a

cam ring carriedby thshcll, cam surfaces on the jaw for engaging the ringin their axial movement with respect to the hell, a

stop, arms on the stop extending between adjacent ends of the jaws, and means to secure the arms to the Shell,

7- A o e r ch k. comp isingashell; Y pl rality of sp c d jaw Within he shel calm r ngs carrie y the shell, a pacer r g e een the cam-r ngs, cam sur a e n th ja s fo engaging the. rings n the r ax a movement with respect tothe shell, a stop,

supportingarms thereon, cam surfaces on the stop, cam, surfaces on v the interior of the jaws ,for engaging therewith .inthe re-r' verse-movement of the jaws, andmeans to secureflthe arms to the spacer ring.

This;speeificationvsigned' this 29 day of ApriLA. D1921 

